The manga adaptation of the new Pokémon movie, The Archdjinni of the Rings: Hoopa (ポケモンザムービーＸ・Ｙ 光輪の超魔神 フーパ) will be collected in a volume and released in Japan July 18, 2015.
The manga is drawn by Kamimura Gin (上村ぎん) and its his first Pokémon manga.
The manga was released in the May issue of CoroCoro Comics (the issue went on sale April 15, 2015). You can read the news here.
Source: https://twitter.com/koumei_shokushu